Yea but unlike Kushina, Naruto Uzumaki genes are much weaker on the grandscale. When the tailed beast was extracted out from Kushina, she had alot of consciousness, but not in the case with Naruto, Naruto only lasted MOSTLY because of the help from Sakura.
I know Zetsu made such statement regarding his Uzumaki genes that allow his lifespan prolonging after being extracted , but Naruto is nothing to compare Kushina.
Furthermore, Minato split the Ninetail in half and sealed inside Naruto and add alot of restrictions, so yeah that's why Naruto is struggling to become a proper shinobi because he mostly inherited Namikaze which further prove that Father genes are superior than Mother according to the context of this series
It doesn't matter if Naruto's survival feat was weaker or nothing compared to Kushina's. The fact of the matter is this:
1. Your logic says that Naruto is 0% Uzumaki.
2. Naruto may not have survived as long as Kushina, but he did survive period (which implies Uzumaki genes).
3. If he was 100% Namikaze he would have died immediately.
In genetics, blood can be diluted, but that doesn't mean that it is non-existent.
Naruto = diluted Uzumaki
Boruto= diluted Hyuuga
Do you see my point here? Even if Boruto doesn't get the byakugan or the chakara expelling kekkei genkai at all, he still has the recessive genes for it. As long as the genes are there (regardless of whether they are dominant or recessive), then Boruto is part Hyuuga.
You seem to obsess over the concept of
mostly. Genetics don't go by mostly. It doesn't matter if your dominant traits are mostly those of one parent. You are still partially the other parent as well. Your actions don't change that. Your skills don't change that. Your personality doesn't change that. If you change your first middle and last names to be the exact same as one of your parents and get a surgery to look exactly like that one parent, you are still partially the other parent.
P.S: Naruto still survived due to Uzumaki genes. When Shukaku was extracted from Gaara, Gaara immediately died. When Kurama was extracted from Naruto, even before they got to Sakura, Gaara still had enough time to carry Naruto on the sand all the way to the battlefield where Sakura was and he even carried on a brief conversation! You can't even say that it was because Shukaku was a full beast while Kurama was split in half because half Kurama still had tons more chakara than all of the other bijuus. Let us not forget about BM Naruto owning 5 bijuus simultaneously.